p2p: migrate secret_connection from tmkms (#696)

* p2p: migrate secret_connection from tmkms

Closes #691

* bring back versions, remove generate_key

* return proper error

* format code

* fixes after xla review

* fixes after @tony-iqlusion review

* specify tendermint and tendermint-proto as path dependencies

* more fixes after @xla review

* remove warnings from lib.rs

melekes@9e253df#r44484475

* make amino dependencies optional

Cargo.toml

@@ -3,6 +3,7 @@
 members = [
     "light-client",
     "light-node",
+    "p2p",
     "proto",
     "rpc",
     "rpc-probe",

p2p/Cargo.toml

@@ -0,0 +1,42 @@
+[package]
+name       = "tendermint-p2p"
+version    = "0.1.0"
+edition    = "2018"
+license    = "Apache-2.0"
+repository = "https://github.com/informalsystems/tendermint-rs"
+readme     = "README.md"
+keywords   = ["p2p", "tendermint", "cosmos"]
+authors    = [
+  "Tony Arcieri <tony@iqlusion.io>",
+  "Ismail Khoffi <Ismail.Khoffi@gmail.com>"
+]
+
+description = """
+    The Tendermint P2P stack.
+    """
+
+[dependencies]
+chacha20poly1305 = "0.7"
+ed25519-dalek = "1"
+eyre = "0.6"
+hkdf = "0.10.0"
+merlin = "2"
+prost = "0.6"
+rand_core = { version = "0.5", features = ["std"] }
+sha2 = "0.9"
+subtle = "2"
+subtle-encoding = { version = "0.5" }
+thiserror = "1"
+x25519-dalek = "1.1"
+zeroize = "1"
+
+# path dependencies
+tendermint = { path = "../tendermint", version = "=0.17.0-rc3" }
+tendermint-proto = { path = "../proto", version = "=0.17.0-rc3" }
+
+# optional dependencies
+prost-amino = { version = "0.6", optional = true }
+prost-amino-derive = { version = "0.6", optional = true }
+
+[features]
+amino = ["prost-amino", "prost-amino-derive"]

p2p/src/error.rs

@@ -0,0 +1,19 @@
+//! Error types
+
+use thiserror::Error;
+
+/// Kinds of errors
+#[derive(Copy, Clone, Debug, Error, Eq, PartialEq)]
+pub enum Error {
+    /// Cryptographic operation failed
+    #[error("cryptographic error")]
+    CryptoError,
+
+    /// Malformatted or otherwise invalid cryptographic key
+    #[error("invalid key")]
+    InvalidKey,
+
+    /// Network protocol-related errors
+    #[error("protocol error")]
+    ProtocolError,
+}

p2p/src/lib.rs

@@ -0,0 +1,18 @@
+//! The Tendermint P2P stack.
+
+#![forbid(unsafe_code)]
+#![deny(
+    trivial_casts,
+    trivial_numeric_casts,
+    unused_import_braces,
+    unused_qualifications,
+    rust_2018_idioms,
+    nonstandard_style
+)]
+#![doc(
+    html_root_url = "https://docs.rs/tendermint-p2p/0.1.0",
+    html_logo_url = "https://raw.githubusercontent.com/informalsystems/tendermint-rs/master/img/logo-tendermint-rs_3961x4001.png"
+)]
+
+pub mod error;
+pub mod secret_connection;